ocioview: Curve Inspector improvements (#1845)

* Curve inspector improvements

- Move README to root app folder
- Change curve inspector grid to always render as a square with 10 segments.
- Add transform init callback to set new transform subscriptions to the current viewer if set to passthrough.

Signed-off-by: Michael Dolan <michdolan@gmail.com>

* Improve log range calculation

Signed-off-by: Michael Dolan <michdolan@gmail.com>

* Improve channel sample comparison

Signed-off-by: Michael Dolan <michdolan@gmail.com>

* Update src/apps/ocioview/ocioview/inspect/curve_inspector.py

Signed-off-by: Michael Dolan <michdolan@gmail.com>

Co-authored-by: Doug Walker <doug.walker@autodesk.com>
Signed-off-by: Michael Dolan <michdolan@gmail.com>

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Signed-off-by: Michael Dolan <michdolan@gmail.com>
Co-authored-by: Doug Walker <doug.walker@autodesk.com>